diff --git a/plugin/filetypes.lua b/plugin/filetypes.lua
index 7759c1f5c..c670bd09b 100644
--- a/plugin/filetypes.lua
+++ b/plugin/filetypes.lua
@@ -25,7 +25,7 @@ local filetypes = {
   janet_simple = { 'janet' },
   javascript = { 'javascriptreact', 'ecma', 'ecmascript', 'jsx', 'js' },
   json = { 'jsonc' },
-  glimmer_javascript = { 'javascript.glimmer' },
+  glimmer_javascript = { 'javascript.glimmer', 'gjs' },
   latex = { 'tex' },
   linkerscript = { 'ld' },
   m68k = { 'asm68k' },
@@ -54,7 +54,7 @@ local filetypes = {
   tlaplus = { 'tla' },
   tsx = { 'typescriptreact', 'typescript.tsx' },
   typescript = { 'ts' },
-  glimmer_typescript = { 'typescript.glimmer' },
+  glimmer_typescript = { 'typescript.glimmer', 'gts },
   typst = { 'typ' },
   udev = { 'udevrules' },
   uxntal = { 'tal', 'uxn' },